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rule win_quickheal_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.quickheal." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.quickheal" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 8b35???????? 3bc7 7429 50 ff15???????? a1???????? } // n = 6, score = 100 // 8b35???????? | // 3bc7 | cmp eax, edi // 7429 | je 0x2b // 50 | push eax // ff15???????? | // a1???????? | $sequence_1 = { 50 64892500000000 81ec50040000 68???????? ff15???????? 8d4c2400 e8???????? } // n = 7, score = 100 // 50 | push eax // 64892500000000 | mov dword ptr fs:[0], esp // 81ec50040000 | sub esp, 0x450 // 68???????? | // ff15???????? | // 8d4c2400 | lea ecx, [esp] // e8???????? | $sequence_2 = { 8a4dff 8d3c8520020410 8bc3 80c901 } // n = 4, score = 100 // 8a4dff | mov cl, byte ptr [ebp - 1] // 8d3c8520020410 | lea edi, [eax*4 + 0x10040220] // 8bc3 | mov eax, ebx // 80c901 | or cl, 1 $sequence_3 = { 8b5c244c 03cb 03e9 8bdd c1eb1d 8d0ced00000000 8be8 } // n = 7, score = 100 // 8b5c244c | mov ebx, dword ptr [esp + 0x4c] // 03cb | add ecx, ebx // 03e9 | add ebp, ecx // 8bdd | mov ebx, ebp // c1eb1d | shr ebx, 0x1d // 8d0ced00000000 | lea ecx, [ebp*8] // 8be8 | mov ebp, eax $sequence_4 = { 8bc8 83e103 f3a4 b907000000 8d742410 } // n = 5, score = 100 // 8bc8 | mov ecx, eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // b907000000 | mov ecx, 7 // 8d742410 | lea esi, [esp + 0x10] $sequence_5 = { 7527 85ed 7523 8b4c2414 e8???????? 53 892d???????? } // n = 7, score = 100 // 7527 | jne 0x29 // 85ed | test ebp, ebp // 7523 | jne 0x25 // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // e8???????? | // 53 | push ebx // 892d???????? | $sequence_6 = { 7505 b83f000000 25fc030000 83e20f } // n = 4, score = 100 // 7505 | jne 7 // b83f000000 | mov eax, 0x3f // 25fc030000 | and eax, 0x3fc // 83e20f | and edx, 0xf $sequence_7 = { 6683f93b 7422 8d9424ec000000 663bcd 7416 668b08 } // n = 6, score = 100 // 6683f93b | cmp cx, 0x3b // 7422 | je 0x24 // 8d9424ec000000 | lea edx, [esp + 0xec] // 663bcd | cmp cx, bp // 7416 | je 0x18 // 668b08 | mov cx, word ptr [eax] $sequence_8 = { 8bce e8???????? 83f810 0f8c48010000 66837c241003 0f853c010000 8b442414 } // n = 7, score = 100 // 8bce | mov ecx, esi // e8???????? | // 83f810 | cmp eax, 0x10 // 0f8c48010000 | jl 0x14e // 66837c241003 | cmp word ptr [esp + 0x10], 3 // 0f853c010000 | jne 0x142 // 8b442414 | mov eax, dword ptr [esp + 0x14] $sequence_9 = { 0f8e6f020000 83c003 c1e802 89442414 8d0c8500000000 894c2410 8b54241c } // n = 7, score = 100 // 0f8e6f020000 | jle 0x275 // 83c003 | add eax, 3 // c1e802 | shr eax, 2 // 89442414 | mov dword ptr [esp + 0x14], eax // 8d0c8500000000 | lea ecx, [eax*4] // 894c2410 | mov dword ptr [esp + 0x10], ecx // 8b54241c | mov edx, dword ptr [esp + 0x1c] condition: 7 of them and filesize < 553984 }
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